Find the next number in the sequence

5 12 24 36 ?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

You can see it everyday, But cannot touch it at will. What is it?

Can you place six X (crosses) in below board without making three in a row in any way ?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Which number comes next in the number series?

2, 9, 30, 93, ?

John can eat 27 chocolates in an hour, Jacob can eat 2 chocolates in 10 minutes, and Jolly can eat 7 chocolates in 20 minutes. How long will it take them to share and eat a box of 120 chocolates whilst playing Chess?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?